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Sources:
http://www.ipac.caltech.edu/wfirst/overview/science/exo/
http://imagine.gsfc.nasa.gov/docs/features/news/grav_lens.html
http://www.cfhtlens.org/public/what-gravitational-lensing
http://www.einstein-online.info/spotlights/grav_lensing_history
http://astro.berkeley.edu/~jcohn/lens.html
http://www.noao.edu/image_gallery/html/im0553.html